Jigglypuff first appears as one of the 151 species of Pokémon in Pokémon Red and Green, and appears in all subsequent installments. It is characterized by its round, pink body, cat-like ears, swirling tuft of hair, and large, glassy eyes. Initially, Jigglypuff was solely a Normal-type Pokémon, but in Generation VI, it gained the newly-introduced Fairy type as its secondary type. The Pokédex categorizes Jigglypuff at #039 as the "Balloon Pokémon".

The Pokédex also provides additional biological info about the Jigglypuff species. After it mesmerizes its foe with its large, round eyes, it sings its lullaby until the foe sleeps, and does not stop to breathe until the foe is fully asleep; it can perform longer with its single breath if it inflates its body with air beforehand. Its vocal chords can freely adjust the wavelength of its voice, and it sings at precisely the right wavelength to make its foes most drowsy. The sound waves of its singing voice match the brain waves of someone in a deep sleep. Nothing can avoid falling asleep after hearing a Jigglypuff's song, but some are more naturally resistant to the effects than others and take much longer to sleep. This effectively endangers a singing Jigglypuff's life because it cannot breathe.

One particular Jigglypuff is a highly prominent and popular recurring character in the Pokémon anime series, often seen carrying a marker that resembles a microphone. It is well known for putting any human or Pokémon to sleep with its irresistible singing; however, this causes it to become angry and scribble over its audience's faces while they are asleep.

Jigglypuff's somewhat feminine appearance may lead others to refer to it as "she". Indeed, while there are both male and female Jigglypuff within the Pokémon universe, females are more common than males, with 75% of all Jigglypuff being female. However, per Nintendo's stance on referring to Pokémon with gender neutral pronouns regardless of gender differences, the Jigglypuff in the Super Smash Bros. series is referred to as "it".

Jigglypuff is one of the four secret characters in Super Smash Bros. Despite not being a lead character in the Pokémon franchise, Jigglypuff was selected to appear in the Super Smash Bros. series due to its similarities to Kirby, which allowed the staff to reuse the model and many animations as a base for Jigglypuff, though Jigglypuff has larger eyes, thinner limbs, and large, triangular ears, as well as a curled tuft of hair on on its head. It was also desirable because of its appearance in the Pokémon anime at the time (as well as Mewtwo, who was originally intended to appear in SSB).

Jigglypuff's Rest attack is considered to be one of the most powerful moves in the game. Aside from sharing similar physical characteristics with Kirby, its jumps are weaker than Kirby's. Jigglypuff is right in the middle of the tier list, being ranked 6 out of 12.

In-game description:

The Balloon PKMN with the big, round eyes. It sings a soothing melody, sending those that hear it to sleep. When mad, it puffs itself up. As a Balloon PKMN, its body is light, weak, and easy to knock away.

Jigglypuff returns in Super Smash Bros. Melee as one of the eleven secret characters. It is unlockable after clearing Classic or Adventure mode with any character, except Mario (unless Dr. Mario is unlocked already). Like a few other characters, it has a new neutral special move, Rollout, which replaces its previous neutral special Pound, now its side special. Jigglypuff has been largely buffed from Smash 64 to Melee, and is now ranked 5th on the tier list in A tier. It is the only character that gets instantly KO'ed from a broken shield, as Jigglypuff is shot upwards at incredible speeds instead of being stunned.

Jigglypuff has three trophies in its name, just like all the other playable characters; the original trophy, the Smash Red trophy, and the Smash Blue trophy. Its original trophy reads as follows:

Jigglypuff

This Balloon Pokémon invites its opponents in close with its big, round eyes and then puts them to sleep with a soothing lullaby. It puffs itself up when angry, and while it may look adorable, it's not to be trifled with: it knows several powerful techniques. Jigglypuff evolves into Wigglytuff after exposure to a Moon Stone.

Pokémon Red & Blue, 09/98 (GB)

Jigglypuff [Smash]

Jigglypuff's normal attacks are weak, and because of its light weight it's easily sent flying. However, with its incredible midair agility, it seems to dance when airborne. Rollout is a powerful speed attack, but be careful not to fly off the edge. Pound does serious damage, and it can also help as a recovery move.

B: Rollout

Smash B: Pound

Jigglypuff [Smash]

Jigglypuff can put its enemies to sleep if they are in range of its Sing attack, although the attack does not work on airborne foes. Rest puts Jigglypuff into a deep sleep, but at the instant it drops off, an intense energy force radiates out of the exact center of its body. If this force comes in contact with an enemy, look out! Rest is Jigglypuff's wild card.

Jigglypuff returns once again in Brawl. Jigglypuff appears the same as before, but is more difficult to unlock than in previous installments of the series, considering it was the 33rd character introduced on the DOJO!! and the last unlockable character to be introduced.

Jigglypuff's Final Smash is Puff Up. It inflates and gets larger and pushes any character off the stage, and Jigglypuff is invulnerable during this form.

Jigglypuff ranks 36th out of 38 (in F tier) on the current tier list, an extreme nerf from Melee. Jigglypuff suffered from the biggest tier drop from Melee to Brawl, going from top tier (middle-high tier when Brawl was released) in Melee to bottom tier in Brawl.

A Balloon Pokémon. It invites opponents in close with its big, round eyes, then puts them to sleep with a sleepy song. The secret to the song's unfailing efficacy is Jigglypuff's ability to sing on the wavelength that will make its opponent the sleepiest. It also uses Attract to infatuate opponents who touch it. It uses a Moon Stone to evolve into Wigglytuff.

Jigglypuff is once again an unlockable playable character in the 3DS version, but a starter character in the Wii U version. Its appearance is now more similar to its appearance in recent Pokémon games, with it having blue eyes for the first time in the Super Smash Bros. series.

Jigglypuff is ranked 55th on the current SSB4tier list in the G tier, a slight drop from its already poor standing in Brawl. Despite its reputation as a bottom tier character in Brawl, Jigglypuff was nerfed in the transition. While its combo ability was restored and Rest and back aerial were given extra KO power, Jigglypuff's recovery, aerials and already poor grounded game were nerfed, its poor endurance has been reduced further thanks to SSB4's weaker shields and the addition of rage, and its edgeguarding ability was nerfed indirectly due to the addition of ledge-trumping. While many veterans have had their recoveries buffed, Jigglypuff's recovery was nerfed, due to its shorter jumps and the lower momentum given by Pound. Lastly, Jigglypuff has received no direct changes whatsoever in game updates, despite the fact that every other character on the roster received changes of some kind. As such, its tournament status remains very poor like in Brawl, having little to no tournament representation and overall poor results.

This Normal/Fairy-type Pokémon is best known for its soothing singing, which can put foes to sleep. In Smash Bros., it fights best in the air and can even jump six times in a row. The downside, though, is that Jigglypuff's so light, most opponents could launch it in their sleep!

This Normal- and Fairy-type Pokémon is best known for its soothing singing, which quite often puts foes to sleep. In this game, Jigglypuff fights best in the air, and can even jump six times in a row. The downside, though, is that Jigglypuff's so light, just about any opponent could launch it in their sleep!

Jigglypuff (All-Star)

Jigglypuff's down special Rest sends this Pokémon into a deep sleep that damages and launches any foe it's touching upon napping. They'll even take damage after being hit! It's a pretty challenging move to land, though, and it leaves Jigglypuff wide open to revenge. Be careful when you use it.

When you use the Rest down special, you go into a deep sleep, as you'd expect. But if anyone is touching you when you do it, you'll inflict a lot of damage and launch them directly upwards. They even continue to take damage afterwards. It's not easy to pull off, though, and falling asleep leaves you open to attacks, so be careful.

Jigglypuff returns as a playable character in Super Smash Bros. Ultimate. Unlike in Super Smash Bros. for Wii U, it has reverted back to being an unlockable character. Although it has been moderately buffed, it still has very exploitable weakness and is thus considered to be an average character at best.

Until SSB4, Jigglypuff had green eyes, the same color as its shiny coloration, instead of the normal blue color seen in its official artwork.

Jigglypuff is the only playable Pokémon in the Super Smash Bros. series to undergo a type change, as it has been reclassified as a Normal/Fairy dual-type Pokémon as of Pokémon X and Y.

Of the four unlockable characters featured in SSB, Jigglypuff spent the longest time as an unlockable character throughout the series until the release of Super Smash Bros. for Wii U, where it finally became a starter character.

Jigglypuff and Zero Suit Samus are the only characters in the Super Smash Bros. series to receive new special moves invoking helplessness in subsequent installments of the Super Smash Bros. series, despite debuting in the series without any. After its debut in SSB, Rollout took the place of Pound as its neutral special (with Pound being relegated to being its side special) in Melee. Rollout renders Jigglypuff helpless after usage in the air, though this property has been removed as of Brawl.

Jigglypuff was considered being cut in Melee and Brawl[1], and Ness was considered being replaced by Lucas in Melee, making them the only known members of the "Original 12" that were considered being cut at certain points in the development of subsequent games in the Super Smash Bros. series.

Jigglypuff is the only character in the Super Smash Bros. series to be fully decloned.

In Ultimate, Jigglypuff is the only character to receive new Japanese voice clips while reusing its English voice clips from previous installments.

Under The Pokémon Company International, Jigglypuff is currently voiced by Michele Knotz in the English dub of the Pokémon anime; however, the Smash Bros. series continues to use the voice of Rachael Lillis, its original voice actress from the anime's 4Kids Entertainment dub.

Both Jigglypuff and Pikachu were the most recently introduced characters at the time of Smash 64's release date.